Github user facaiy commented on a diff in the pull request:
https://github.com/apache/spark/pull/18556#discussion_r126023986
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/source/libsvm/LibSVMRelation.scala ---
@@ -89,18 +93,17 @@ private[libsvm] class LibSVMFileFormat extends
TextBasedFileFormat with DataSour
files: Seq[FileStatus]): Option[StructType] = {
val libSVMOptions = new LibSVMOptions(options)
val numFeatures: Int = libSVMOptions.numFeatures.getOrElse {
- // Infers number of features if the user doesn't specify (a valid)
one.
- val dataFiles = files.filterNot(_.getPath.getName startsWith "_")
- val path = if (dataFiles.length == 1) {
- dataFiles.head.getPath.toUri.toString
- } else if (dataFiles.isEmpty) {
+ if (files.isEmpty) {
throw new IOException("No input path specified for libsvm data")
- } else {
- throw new IOException("Multiple input paths are not supported for
libsvm data.")
+ } else if (files.length > 1) {
+ logWarning(
+ "Multiple input paths detected, determining the number of
features by going " +
--- End diff --
Good. How about warning only if `numFeature` is missing? I mean, remove the
condition `files.length > 1`
```scala
if (files.isEmpty) { }
else { ... logWarning ...}
```
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